Isotretinoin without Doctor?

I am an American 47 y/o male who has lived with a greasy, oily face my whole life (no acne prob). I have tried every OTC product made for oily skin with no success. Normally, within 1 hour of washing my face it is coated in oil again. About 3 months ago I started taking Isotretinoin 10mg M/W/F. It has worked great. My face is normal. About 1 month ago my neck starting hurting (feels like stiff neck). Should I discontinue using it or reduce dosage? I now live in Japan, no Dr & bought med in Thai.

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